Steps to reproduce the issue

• Set TinyMCE as your default Editor
• Run the following code:

$editor = JFactory::getEditor();
echo $editor->display( 'some[name]', '', '100%' , '20%' , '100' , '10' );

Expected result

The WYSIWYG TinyMCE editor shows up.

Actual result

<textarea> shows up, clicking on Toggle Editor will turn it into the WYSIWYG editor.

System information (as much as possible)

Joomla! 3.6.0

Additional comments

Found the resolution, will provide a PR as soon as possible.